At the Companhia Siderúrgica Nacional Mineração (CSN) Casa de Pedra Mine at Congonhas in the Quadrilátero Ferrífero.

In the mine, Top left:   mine geologist Rafael Rodrigues explains aspects of the ore deposit;   Lower left: Claret Campos (left), CSN Manager, Development & Technology explains aspects of the operation in the pit;   Upper middle and right: inspecting strongly foliated, high grade itabirite.   Note the same foliation dip behind the shovel on the lower middle image.
Photographs by Mike Porter.